Radon System Installation Tide

When I bought my first house in York County, radon was the last thing on my mind. The home inspector mentioned it, handed me a small canister, and said something about mailing it to a lab. I forgot about it for three weeks. When the results came back at 8.7 picocuries per liter, I learned two things quickly: the EPA action level is 4.0, and radon mitigation is not a weekend DIY project. That experience taught me what matters in radon system installation, and I have been foll